Used in a weak or scaly top in narrow rooms or entries that have short
life. It is done by placing lagging bars running parallel with the working
place above the header. It has limited uses because of necessary
additional height and because its weight rests on the center of the
header. See also: stringerSource:
Dictionary of Mining, Mineral, and Related Terms

What Topic Is
Your Geology Paper On?

ENTER
YOUR TOPIC
HERE:

Over 70,000 Research Papers,
Essays & Term Papers - Ready to Download!